ip/link_gre.c

   1 /*
   2  * link_gre.c   gre driver module
   3  *
   4  *              This program is free software; you can redistribute it and/or
   5  *              modify it under the terms of the GNU General Public License
   6  *              as published by the Free Software Foundation; either version
   7  *              2 of the License, or (at your option) any later version.
   8  *
   9  * Authors:     Herbert Xu <herbert@gondor.apana.org.au>
  10  *
  11  */
  12
  13 #include <string.h>
  14 #include <net/if.h>
  15 #include <sys/types.h>
  16 #include <sys/socket.h>
  17 #include <arpa/inet.h>
  18
  19 #include <linux/ip.h>
  20 #include <linux/if_tunnel.h>
  21 #include "rt_names.h"
  22 #include "utils.h"
  23 #include "ip_common.h"
  24 #include "tunnel.h"
  25
  26 static void print_usage(FILE *f)
  27 {
  28         fprintf(f,
  29                 "Usage: ... { gre | gretap | erspan } [ remote ADDR ]\n"
  30                 "                            [ local ADDR ]\n"
  31                 "                            [ [i|o]seq ]\n"
  32                 "                            [ [i|o]key KEY ]\n"
  33                 "                            [ [i|o]csum ]\n"
  34                 "                            [ ttl TTL ]\n"
  35                 "                            [ tos TOS ]\n"
  36                 "                            [ [no]pmtudisc ]\n"
  37                 "                            [ [no]ignore-df ]\n"
  38                 "                            [ dev PHYS_DEV ]\n"
  39                 "                            [ noencap ]\n"
  40                 "                            [ encap { fou | gue | none } ]\n"
  41                 "                            [ encap-sport PORT ]\n"
  42                 "                            [ encap-dport PORT ]\n"
  43                 "                            [ [no]encap-csum ]\n"
  44                 "                            [ [no]encap-csum6 ]\n"
  45                 "                            [ [no]encap-remcsum ]\n"
  46                 "                            [ external ]\n"
  47                 "                            [ fwmark MARK ]\n"
  48                 "                            [ erspan_ver version ]\n"
  49                 "                            [ erspan IDX ]\n"
  50                 "                            [ erspan_dir { ingress | egress } ]\n"
  51                 "                            [ erspan_hwid hwid ]\n"
  52                 "                            [ external ]\n"
  53                 "\n"
  54                 "Where: ADDR := { IP_ADDRESS | any }\n"
  55                 "       TOS  := { NUMBER | inherit }\n"
  56                 "       TTL  := { 1..255 | inherit }\n"
  57                 "       KEY  := { DOTTED_QUAD | NUMBER }\n"
  58                 "       MARK := { 0x0..0xffffffff }\n"
  59         );
  60 }
  61
  62 static void usage(void) __attribute__((noreturn));
  63 static void usage(void)
  64 {
  65         print_usage(stderr);
  66         exit(-1);
  67 }
  68
  69 static int gre_parse_opt(struct link_util *lu, int argc, char **argv,
  70                          struct nlmsghdr *n)
  71 {
  72         struct ifinfomsg *ifi = (struct ifinfomsg *)(n + 1);
  73         struct {
  74                 struct nlmsghdr n;
  75                 struct ifinfomsg i;
  76         } req = {
  77                 .n.nlmsg_len = NLMSG_LENGTH(sizeof(*ifi)),
  78                 .n.nlmsg_flags = NLM_F_REQUEST,
  79                 .n.nlmsg_type = RTM_GETLINK,
  80                 .i.ifi_family = preferred_family,
  81                 .i.ifi_index = ifi->ifi_index,
  82         };
  83         struct nlmsghdr *answer;
  84         struct rtattr *tb[IFLA_MAX + 1];
  85         struct rtattr *linkinfo[IFLA_INFO_MAX+1];
  86         struct rtattr *greinfo[IFLA_GRE_MAX + 1];
  87         __u16 iflags = 0;
  88         __u16 oflags = 0;
  89         __be32 ikey = 0;
  90         __be32 okey = 0;
  91         unsigned int saddr = 0;
  92         unsigned int daddr = 0;
  93         unsigned int link = 0;
  94         __u8 pmtudisc = 1;
  95         __u8 ttl = 0;
  96         __u8 tos = 0;
  97         int len;
  98         __u16 encaptype = 0;
  99         __u16 encapflags = 0;
 100         __u16 encapsport = 0;
 101         __u16 encapdport = 0;
 102         __u8 metadata = 0;
 103         __u8 ignore_df = 0;
 104         __u32 fwmark = 0;
 105         __u32 erspan_idx = 0;
 106         __u8 erspan_ver = 0;
 107         __u8 erspan_dir = 0;
 108         __u16 erspan_hwid = 0;
 109
 110         if (!(n->nlmsg_flags & NLM_F_CREATE)) {
 111                 if (rtnl_talk(&rth, &req.n, &answer) < 0) {
 112 get_failed:
 113                         fprintf(stderr,
 114                                 "Failed to get existing tunnel info.\n");
 115                         return -1;
 116                 }
 117
 118                 len = answer->nlmsg_len;
 119                 len -= NLMSG_LENGTH(sizeof(*ifi));
 120                 if (len < 0)
 121                         goto get_failed;
 122
 123                 parse_rtattr(tb, IFLA_MAX, IFLA_RTA(NLMSG_DATA(answer)), len);
 124
 125                 if (!tb[IFLA_LINKINFO])
 126                         goto get_failed;
 127
 128                 parse_rtattr_nested(linkinfo, IFLA_INFO_MAX, tb[IFLA_LINKINFO]);
 129
 130                 if (!linkinfo[IFLA_INFO_DATA])
 131                         goto get_failed;
 132
 133                 parse_rtattr_nested(greinfo, IFLA_GRE_MAX,
 134                                     linkinfo[IFLA_INFO_DATA]);
 135
 136                 if (greinfo[IFLA_GRE_IKEY])
 137                         ikey = rta_getattr_u32(greinfo[IFLA_GRE_IKEY]);
 138
 139                 if (greinfo[IFLA_GRE_OKEY])
 140                         okey = rta_getattr_u32(greinfo[IFLA_GRE_OKEY]);
 141
 142                 if (greinfo[IFLA_GRE_IFLAGS])
 143                         iflags = rta_getattr_u16(greinfo[IFLA_GRE_IFLAGS]);
 144
 145                 if (greinfo[IFLA_GRE_OFLAGS])
 146                         oflags = rta_getattr_u16(greinfo[IFLA_GRE_OFLAGS]);
 147
 148                 if (greinfo[IFLA_GRE_LOCAL])
 149                         saddr = rta_getattr_u32(greinfo[IFLA_GRE_LOCAL]);
 150
 151                 if (greinfo[IFLA_GRE_REMOTE])
 152                         daddr = rta_getattr_u32(greinfo[IFLA_GRE_REMOTE]);
 153
 154                 if (greinfo[IFLA_GRE_PMTUDISC])
 155                         pmtudisc = rta_getattr_u8(
 156                                 greinfo[IFLA_GRE_PMTUDISC]);
 157
 158                 if (greinfo[IFLA_GRE_TTL])
 159                         ttl = rta_getattr_u8(greinfo[IFLA_GRE_TTL]);
 160
 161                 if (greinfo[IFLA_GRE_TOS])
 162                         tos = rta_getattr_u8(greinfo[IFLA_GRE_TOS]);
 163
 164                 if (greinfo[IFLA_GRE_LINK])
 165                         link = rta_getattr_u32(greinfo[IFLA_GRE_LINK]);
 166
 167                 if (greinfo[IFLA_GRE_ENCAP_TYPE])
 168                         encaptype = rta_getattr_u16(greinfo[IFLA_GRE_ENCAP_TYPE]);
 169                 if (greinfo[IFLA_GRE_ENCAP_FLAGS])
 170                         encapflags = rta_getattr_u16(greinfo[IFLA_GRE_ENCAP_FLAGS]);
 171                 if (greinfo[IFLA_GRE_ENCAP_SPORT])
 172                         encapsport = rta_getattr_u16(greinfo[IFLA_GRE_ENCAP_SPORT]);
 173                 if (greinfo[IFLA_GRE_ENCAP_DPORT])
 174                         encapdport = rta_getattr_u16(greinfo[IFLA_GRE_ENCAP_DPORT]);
 175
 176                 if (greinfo[IFLA_GRE_COLLECT_METADATA])
 177                         metadata = 1;
 178
 179                 if (greinfo[IFLA_GRE_IGNORE_DF])
 180                         ignore_df =
 181                                 !!rta_getattr_u8(greinfo[IFLA_GRE_IGNORE_DF]);
 182
 183                 if (greinfo[IFLA_GRE_FWMARK])
 184                         fwmark = rta_getattr_u32(greinfo[IFLA_GRE_FWMARK]);
 185
 186                 if (greinfo[IFLA_GRE_ERSPAN_INDEX])
 187                         erspan_idx = rta_getattr_u32(greinfo[IFLA_GRE_ERSPAN_INDEX]);
 188
 189                 if (greinfo[IFLA_GRE_ERSPAN_VER])
 190                         erspan_ver = rta_getattr_u8(greinfo[IFLA_GRE_ERSPAN_VER]);
 191
 192                 if (greinfo[IFLA_GRE_ERSPAN_DIR])
 193                         erspan_dir = rta_getattr_u8(greinfo[IFLA_GRE_ERSPAN_DIR]);
 194
 195                 if (greinfo[IFLA_GRE_ERSPAN_HWID])
 196                         erspan_hwid = rta_getattr_u16(greinfo[IFLA_GRE_ERSPAN_HWID]);
 197
 198                 free(answer);
 199         }
 200
 201         while (argc > 0) {
 202                 if (!matches(*argv, "key")) {
 203                         NEXT_ARG();
 204                         iflags |= GRE_KEY;
 205                         oflags |= GRE_KEY;
 206                         ikey = okey = tnl_parse_key("key", *argv);
 207                 } else if (!matches(*argv, "ikey")) {
 208                         NEXT_ARG();
 209                         iflags |= GRE_KEY;
 210                         ikey = tnl_parse_key("ikey", *argv);
 211                 } else if (!matches(*argv, "okey")) {
 212                         NEXT_ARG();
 213                         oflags |= GRE_KEY;
 214                         okey = tnl_parse_key("okey", *argv);
 215                 } else if (!matches(*argv, "seq")) {
 216                         iflags |= GRE_SEQ;
 217                         oflags |= GRE_SEQ;
 218                 } else if (!matches(*argv, "iseq")) {
 219                         iflags |= GRE_SEQ;
 220                 } else if (!matches(*argv, "oseq")) {
 221                         oflags |= GRE_SEQ;
 222                 } else if (!matches(*argv, "csum")) {
 223                         iflags |= GRE_CSUM;
 224                         oflags |= GRE_CSUM;
 225                 } else if (!matches(*argv, "icsum")) {
 226                         iflags |= GRE_CSUM;
 227                 } else if (!matches(*argv, "ocsum")) {
 228                         oflags |= GRE_CSUM;
 229                 } else if (!matches(*argv, "nopmtudisc")) {
 230                         pmtudisc = 0;
 231                 } else if (!matches(*argv, "pmtudisc")) {
 232                         pmtudisc = 1;
 233                 } else if (!matches(*argv, "remote")) {
 234                         NEXT_ARG();
 235                         daddr = get_addr32(*argv);
 236                 } else if (!matches(*argv, "local")) {
 237                         NEXT_ARG();
 238                         saddr = get_addr32(*argv);
 239                 } else if (!matches(*argv, "dev")) {
 240                         NEXT_ARG();
 241                         link = if_nametoindex(*argv);
 242                         if (link == 0) {
 243                                 fprintf(stderr, "Cannot find device \"%s\"\n",
 244                                         *argv);
 245                                 exit(-1);
 246                         }
 247                 } else if (!matches(*argv, "ttl") ||
 248                            !matches(*argv, "hoplimit")) {
 249                         unsigned int uval;
 250
 251                         NEXT_ARG();
 252                         if (strcmp(*argv, "inherit") != 0) {
 253                                 if (get_unsigned(&uval, *argv, 0))
 254                                         invarg("invalid TTL\n", *argv);
 255                                 if (uval > 255)
 256                                         invarg("TTL must be <= 255\n", *argv);
 257                                 ttl = uval;
 258                         } else
 259                                 ttl = 0;
 260                 } else if (!matches(*argv, "tos") ||
 261                            !matches(*argv, "tclass") ||
 262                            !matches(*argv, "dsfield")) {
 263                         __u32 uval;
 264
 265                         NEXT_ARG();
 266                         if (strcmp(*argv, "inherit") != 0) {
 267                                 if (rtnl_dsfield_a2n(&uval, *argv))
 268                                         invarg("bad TOS value", *argv);
 269                                 tos = uval;
 270                         } else
 271                                 tos = 1;
 272                 } else if (strcmp(*argv, "noencap") == 0) {
 273                         encaptype = TUNNEL_ENCAP_NONE;
 274                 } else if (strcmp(*argv, "encap") == 0) {
 275                         NEXT_ARG();
 276                         if (strcmp(*argv, "fou") == 0)
 277                                 encaptype = TUNNEL_ENCAP_FOU;
 278                         else if (strcmp(*argv, "gue") == 0)
 279                                 encaptype = TUNNEL_ENCAP_GUE;
 280                         else if (strcmp(*argv, "none") == 0)
 281                                 encaptype = TUNNEL_ENCAP_NONE;
 282                         else
 283                                 invarg("Invalid encap type.", *argv);
 284                 } else if (strcmp(*argv, "encap-sport") == 0) {
 285                         NEXT_ARG();
 286                         if (strcmp(*argv, "auto") == 0)
 287                                 encapsport = 0;
 288                         else if (get_u16(&encapsport, *argv, 0))
 289                                 invarg("Invalid source port.", *argv);
 290                 } else if (strcmp(*argv, "encap-dport") == 0) {
 291                         NEXT_ARG();
 292                         if (get_u16(&encapdport, *argv, 0))
 293                                 invarg("Invalid destination port.", *argv);
 294                 } else if (strcmp(*argv, "encap-csum") == 0) {
 295                         encapflags |= TUNNEL_ENCAP_FLAG_CSUM;
 296                 } else if (strcmp(*argv, "noencap-csum") == 0) {
 297                         encapflags &= ~TUNNEL_ENCAP_FLAG_CSUM;
 298                 } else if (strcmp(*argv, "encap-udp6-csum") == 0) {
 299                         encapflags |= TUNNEL_ENCAP_FLAG_CSUM6;
 300                 } else if (strcmp(*argv, "noencap-udp6-csum") == 0) {
 301                         encapflags &= ~TUNNEL_ENCAP_FLAG_CSUM6;
 302                 } else if (strcmp(*argv, "encap-remcsum") == 0) {
 303                         encapflags |= TUNNEL_ENCAP_FLAG_REMCSUM;
 304                 } else if (strcmp(*argv, "noencap-remcsum") == 0) {
 305                         encapflags &= ~TUNNEL_ENCAP_FLAG_REMCSUM;
 306                 } else if (strcmp(*argv, "external") == 0) {
 307                         metadata = 1;
 308                 } else if (strcmp(*argv, "ignore-df") == 0) {
 309                         ignore_df = 1;
 310                 } else if (strcmp(*argv, "noignore-df") == 0) {
 311                         /*
 312                          *only the lsb is significant, use 2 for presence
 313                          */
 314                         ignore_df = 2;
 315                 } else if (strcmp(*argv, "fwmark") == 0) {
 316                         NEXT_ARG();
 317                         if (get_u32(&fwmark, *argv, 0))
 318                                 invarg("invalid fwmark\n", *argv);
 319                 } else if (strcmp(*argv, "erspan") == 0) {
 320                         NEXT_ARG();
 321                         if (get_u32(&erspan_idx, *argv, 0))
 322                                 invarg("invalid erspan index\n", *argv);
 323                         if (erspan_idx & ~((1<<20) - 1) || erspan_idx == 0)
 324                                 invarg("erspan index must be > 0 and <= 20-bit\n", *argv);
 325                 } else if (strcmp(*argv, "erspan_ver") == 0) {
 326                         NEXT_ARG();
 327                         if (get_u8(&erspan_ver, *argv, 0))
 328                                 invarg("invalid erspan version\n", *argv);
 329                         if (erspan_ver != 1 && erspan_ver != 2)
 330                                 invarg("erspan version must be 1 or 2\n", *argv);
 331                 } else if (strcmp(*argv, "erspan_dir") == 0) {
 332                         NEXT_ARG();
 333                         if (matches(*argv, "ingress") == 0)
 334                                 erspan_dir = 0;
 335                         else if (matches(*argv, "egress") == 0)
 336                                 erspan_dir = 1;
 337                         else
 338                                 invarg("Invalid erspan direction.", *argv);
 339                 } else if (strcmp(*argv, "erspan_hwid") == 0) {
 340                         NEXT_ARG();
 341                         if (get_u16(&erspan_hwid, *argv, 0))
 342                                 invarg("invalid erspan hwid\n", *argv);
 343                 } else
 344                         usage();
 345                 argc--; argv++;
 346         }
 347
 348         if (!ikey && IN_MULTICAST(ntohl(daddr))) {
 349                 ikey = daddr;
 350                 iflags |= GRE_KEY;
 351         }
 352         if (!okey && IN_MULTICAST(ntohl(daddr))) {
 353                 okey = daddr;
 354                 oflags |= GRE_KEY;
 355         }
 356         if (IN_MULTICAST(ntohl(daddr)) && !saddr) {
 357                 fprintf(stderr, "A broadcast tunnel requires a source address.\n");
 358                 return -1;
 359         }
 360
 361         if (!metadata) {
 362                 addattr32(n, 1024, IFLA_GRE_IKEY, ikey);
 363                 addattr32(n, 1024, IFLA_GRE_OKEY, okey);
 364                 addattr_l(n, 1024, IFLA_GRE_IFLAGS, &iflags, 2);
 365                 addattr_l(n, 1024, IFLA_GRE_OFLAGS, &oflags, 2);
 366                 addattr_l(n, 1024, IFLA_GRE_LOCAL, &saddr, 4);
 367                 addattr_l(n, 1024, IFLA_GRE_REMOTE, &daddr, 4);
 368                 addattr_l(n, 1024, IFLA_GRE_PMTUDISC, &pmtudisc, 1);
 369                 if (link)
 370                         addattr32(n, 1024, IFLA_GRE_LINK, link);
 371                 addattr_l(n, 1024, IFLA_GRE_TTL, &ttl, 1);
 372                 addattr_l(n, 1024, IFLA_GRE_TOS, &tos, 1);
 373                 addattr32(n, 1024, IFLA_GRE_FWMARK, fwmark);
 374                 if (erspan_ver) {
 375                         addattr8(n, 1024, IFLA_GRE_ERSPAN_VER, erspan_ver);
 376                         if (erspan_ver == 1 && erspan_idx != 0) {
 377                                 addattr32(n, 1024, IFLA_GRE_ERSPAN_INDEX, erspan_idx);
 378                         } else if (erspan_ver == 2) {
 379                                 addattr8(n, 1024, IFLA_GRE_ERSPAN_DIR, erspan_dir);
 380                                 addattr16(n, 1024, IFLA_GRE_ERSPAN_HWID, erspan_hwid);
 381                         }
 382                 }
 383         } else {
 384                 addattr_l(n, 1024, IFLA_GRE_COLLECT_METADATA, NULL, 0);
 385         }
 386
 387         addattr16(n, 1024, IFLA_GRE_ENCAP_TYPE, encaptype);
 388         addattr16(n, 1024, IFLA_GRE_ENCAP_FLAGS, encapflags);
 389         addattr16(n, 1024, IFLA_GRE_ENCAP_SPORT, htons(encapsport));
 390         addattr16(n, 1024, IFLA_GRE_ENCAP_DPORT, htons(encapdport));
 391
 392         if (ignore_df)
 393                 addattr8(n, 1024, IFLA_GRE_IGNORE_DF, ignore_df & 1);
 394
 395         return 0;
 396 }
 397
 398 static void gre_print_direct_opt(FILE *f, struct rtattr *tb[])
 399 {
 400         char s2[64];
 401         const char *local = "any";
 402         const char *remote = "any";
 403         unsigned int iflags = 0;
 404         unsigned int oflags = 0;
 405
 406         if (tb[IFLA_GRE_REMOTE]) {
 407                 unsigned int addr = rta_getattr_u32(tb[IFLA_GRE_REMOTE]);
 408
 409                 if (addr)
 410                         remote = format_host(AF_INET, 4, &addr);
 411         }
 412
 413         print_string(PRINT_ANY, "remote", "remote %s ", remote);
 414
 415         if (tb[IFLA_GRE_LOCAL]) {
 416                 unsigned int addr = rta_getattr_u32(tb[IFLA_GRE_LOCAL]);
 417
 418                 if (addr)
 419                         local = format_host(AF_INET, 4, &addr);
 420         }
 421
 422         print_string(PRINT_ANY, "local", "local %s ", local);
 423
 424         if (tb[IFLA_GRE_LINK] && rta_getattr_u32(tb[IFLA_GRE_LINK])) {
 425                 unsigned int link = rta_getattr_u32(tb[IFLA_GRE_LINK]);
 426                 const char *n = if_indextoname(link, s2);
 427
 428                 if (n)
 429                         print_string(PRINT_ANY, "link", "dev %s ", n);
 430                 else
 431                         print_uint(PRINT_ANY, "link_index", "dev %u ", link);
 432         }
 433
 434         if (tb[IFLA_GRE_TTL]) {
 435                 __u8 ttl = rta_getattr_u8(tb[IFLA_GRE_TTL]);
 436
 437                 if (ttl)
 438                         print_int(PRINT_ANY, "ttl", "ttl %d ", ttl);
 439                 else
 440                         print_int(PRINT_JSON, "ttl", NULL, ttl);
 441         } else {
 442                 print_string(PRINT_FP, NULL, "ttl %s ", "inherit");
 443         }
 444
 445         if (tb[IFLA_GRE_TOS] && rta_getattr_u8(tb[IFLA_GRE_TOS])) {
 446                 int tos = rta_getattr_u8(tb[IFLA_GRE_TOS]);
 447
 448                 if (is_json_context()) {
 449                         SPRINT_BUF(b1);
 450
 451                         snprintf(b1, sizeof(b1), "0x%x", tos);
 452                         print_string(PRINT_JSON, "tos", NULL, b1);
 453                 } else {
 454                         fputs("tos ", f);
 455                         if (tos == 1)
 456                                 fputs("inherit ", f);
 457                         else
 458                                 fprintf(f, "0x%x ", tos);
 459                 }
 460         }
 461
 462         if (tb[IFLA_GRE_PMTUDISC]) {
 463                 if (!rta_getattr_u8(tb[IFLA_GRE_PMTUDISC]))
 464                         print_bool(PRINT_ANY, "pmtudisc", "nopmtudisc ", false);
 465                 else
 466                         print_bool(PRINT_JSON, "pmtudisc", NULL, true);
 467         }
 468
 469         if (tb[IFLA_GRE_IFLAGS])
 470                 iflags = rta_getattr_u16(tb[IFLA_GRE_IFLAGS]);
 471
 472         if (tb[IFLA_GRE_OFLAGS])
 473                 oflags = rta_getattr_u16(tb[IFLA_GRE_OFLAGS]);
 474
 475         if ((iflags & GRE_KEY) && tb[IFLA_GRE_IKEY]) {
 476                 inet_ntop(AF_INET, RTA_DATA(tb[IFLA_GRE_IKEY]), s2, sizeof(s2));
 477                 print_string(PRINT_ANY, "ikey", "ikey %s ", s2);
 478         }
 479
 480         if ((oflags & GRE_KEY) && tb[IFLA_GRE_OKEY]) {
 481                 inet_ntop(AF_INET, RTA_DATA(tb[IFLA_GRE_OKEY]), s2, sizeof(s2));
 482                 print_string(PRINT_ANY, "okey", "okey %s ", s2);
 483         }
 484
 485         if (iflags & GRE_SEQ)
 486                 print_bool(PRINT_ANY, "iseq", "iseq ", true);
 487         if (oflags & GRE_SEQ)
 488                 print_bool(PRINT_ANY, "oseq", "oseq ", true);
 489         if (iflags & GRE_CSUM)
 490                 print_bool(PRINT_ANY, "icsum", "icsum ", true);
 491         if (oflags & GRE_CSUM)
 492                 print_bool(PRINT_ANY, "ocsum", "ocsum ", true);
 493
 494         if (tb[IFLA_GRE_FWMARK]) {
 495                 __u32 fwmark = rta_getattr_u32(tb[IFLA_GRE_FWMARK]);
 496
 497                 if (fwmark) {
 498                         snprintf(s2, sizeof(s2), "0x%x", fwmark);
 499
 500                         print_string(PRINT_ANY, "fwmark", "fwmark %s ", s2);
 501                 }
 502         }
 503 }
 504
 505 static void gre_print_opt(struct link_util *lu, FILE *f, struct rtattr *tb[])
 506 {
 507         if (!tb)
 508                 return;
 509
 510         if (!tb[IFLA_GRE_COLLECT_METADATA])
 511                 gre_print_direct_opt(f, tb);
 512         else
 513                 print_bool(PRINT_ANY, "external", "external ", true);
 514
 515         if (tb[IFLA_GRE_IGNORE_DF] && rta_getattr_u8(tb[IFLA_GRE_IGNORE_DF]))
 516                 print_bool(PRINT_ANY, "ignore_df", "ignore-df ", true);
 517
 518         if (tb[IFLA_GRE_ERSPAN_INDEX]) {
 519                 __u32 erspan_idx = rta_getattr_u32(tb[IFLA_GRE_ERSPAN_INDEX]);
 520
 521                 print_uint(PRINT_ANY, "erspan_index", "erspan_index %u ", erspan_idx);
 522         }
 523
 524         if (tb[IFLA_GRE_ERSPAN_VER]) {
 525                 __u8 erspan_ver = rta_getattr_u8(tb[IFLA_GRE_ERSPAN_VER]);
 526
 527                 print_uint(PRINT_ANY, "erspan_ver", "erspan_ver %u ", erspan_ver);
 528         }
 529
 530         if (tb[IFLA_GRE_ERSPAN_DIR]) {
 531                 __u8 erspan_dir = rta_getattr_u8(tb[IFLA_GRE_ERSPAN_DIR]);
 532
 533                 if (erspan_dir == 0)
 534                         print_string(PRINT_ANY, "erspan_dir",
 535                                      "erspan_dir ingress ", NULL);
 536                 else
 537                         print_string(PRINT_ANY, "erspan_dir",
 538                                      "erspan_dir egress ", NULL);
 539         }
 540
 541         if (tb[IFLA_GRE_ERSPAN_HWID]) {
 542                 __u16 erspan_hwid = rta_getattr_u16(tb[IFLA_GRE_ERSPAN_HWID]);
 543
 544                 print_hex(PRINT_ANY, "erspan_hwid", "erspan_hwid 0x%x ", erspan_hwid);
 545         }
 546
 547         if (tb[IFLA_GRE_ENCAP_TYPE] &&
 548             rta_getattr_u16(tb[IFLA_GRE_ENCAP_TYPE]) != TUNNEL_ENCAP_NONE) {
 549                 __u16 type = rta_getattr_u16(tb[IFLA_GRE_ENCAP_TYPE]);
 550                 __u16 flags = rta_getattr_u16(tb[IFLA_GRE_ENCAP_FLAGS]);
 551                 __u16 sport = rta_getattr_u16(tb[IFLA_GRE_ENCAP_SPORT]);
 552                 __u16 dport = rta_getattr_u16(tb[IFLA_GRE_ENCAP_DPORT]);
 553
 554
 555                 open_json_object("encap");
 556                 print_string(PRINT_FP, NULL, "encap ", NULL);
 557
 558                 switch (type) {
 559                 case TUNNEL_ENCAP_FOU:
 560                         print_string(PRINT_ANY, "type", "%s ", "fou");
 561                         break;
 562                 case TUNNEL_ENCAP_GUE:
 563                         print_string(PRINT_ANY, "type", "%s ", "gue");
 564                         break;
 565                 default:
 566                         print_null(PRINT_ANY, "type", "%s ", "unknown");
 567                         break;
 568                 }
 569
 570                 if (is_json_context()) {
 571                         print_uint(PRINT_JSON,
 572                                    "sport",
 573                                    NULL,
 574                                    sport ? ntohs(sport) : 0);
 575                         print_uint(PRINT_JSON, "dport", NULL, ntohs(dport));
 576
 577                         print_bool(PRINT_JSON,
 578                                    "csum",
 579                                    NULL,
 580                                    flags & TUNNEL_ENCAP_FLAG_CSUM);
 581
 582                         print_bool(PRINT_JSON,
 583                                    "csum6",
 584                                    NULL,
 585                                    flags & TUNNEL_ENCAP_FLAG_CSUM6);
 586
 587                         print_bool(PRINT_JSON,
 588                                    "remcsum",
 589                                    NULL,
 590                                    flags & TUNNEL_ENCAP_FLAG_REMCSUM);
 591
 592                         close_json_object();
 593                 } else {
 594                         if (sport == 0)
 595                                 fputs("encap-sport auto ", f);
 596                         else
 597                                 fprintf(f, "encap-sport %u", ntohs(sport));
 598
 599                         fprintf(f, "encap-dport %u ", ntohs(dport));
 600
 601                         if (flags & TUNNEL_ENCAP_FLAG_CSUM)
 602                                 fputs("encap-csum ", f);
 603                         else
 604                                 fputs("noencap-csum ", f);
 605
 606                         if (flags & TUNNEL_ENCAP_FLAG_CSUM6)
 607                                 fputs("encap-csum6 ", f);
 608                         else
 609                                 fputs("noencap-csum6 ", f);
 610
 611                         if (flags & TUNNEL_ENCAP_FLAG_REMCSUM)
 612                                 fputs("encap-remcsum ", f);
 613                         else
 614                                 fputs("noencap-remcsum ", f);
 615                 }
 616         }
 617 }
 618
 619 static void gre_print_help(struct link_util *lu, int argc, char **argv,
 620                            FILE *f)
 621 {
 622         print_usage(f);
 623 }
 624
 625 struct link_util gre_link_util = {
 626         .id = "gre",
 627         .maxattr = IFLA_GRE_MAX,
 628         .parse_opt = gre_parse_opt,
 629         .print_opt = gre_print_opt,
 630         .print_help = gre_print_help,
 631 };
 632
 633 struct link_util gretap_link_util = {
 634         .id = "gretap",
 635         .maxattr = IFLA_GRE_MAX,
 636         .parse_opt = gre_parse_opt,
 637         .print_opt = gre_print_opt,
 638         .print_help = gre_print_help,
 639 };
 640
 641 struct link_util erspan_link_util = {
 642         .id = "erspan",
 643         .maxattr = IFLA_GRE_MAX,
 644         .parse_opt = gre_parse_opt,
 645         .print_opt = gre_print_opt,
 646         .print_help = gre_print_help,
 647 };